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IEEE Control Systems

Issue 3 • Date June 1992

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Displaying Results 1 - 17 of 17
  • The joy of feedback: nonlinear and adaptive

    Publication Year: 1992, Page(s):7 - 17
    Cited by:  Papers (225)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (742 KB)

    It is argued that, for a cautious design, a nonlinear analysis is needed to reveal when and why linear tools fail. Emerging nonlinear tools that can be used to overcome the limitations of nonlinear designs are discussed. It is shown that some of these tools can be made adaptive and applied to nonlinear systems with unknown parameters. The emergence of robust designs for nonlinear 'interval' plants... View full abstract»

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  • Lund control program combines theory with hands-on experience

    Publication Year: 1992, Page(s):22 - 30
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (982 KB)

    The control laboratory and curriculum at Lund Institute of Technology in Sweden are described. Their major goal is to give students a strong background in control theory and an engineering ability to make control systems that work. This is accomplished with a coordinated course structure that is applicable to undergraduates, graduates, and continuing education. The program's control laboratory uti... View full abstract»

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  • Dynamics and control design project offers taste of real world

    Publication Year: 1992, Page(s):31 - 38
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (514 KB)

    A design project in dynamics and control performed by a group of seven senior students during one semester is described. The objective was to construct a wedge-shaped object and balance it in the inverted position. The degree of complexity of the dynamics of this wedge system is comparable to the well-known inverted pendulum and ball-on-a-rail experiments. The main advantage of the wedge experimen... View full abstract»

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  • A course on microprocessor-based control systems

    Publication Year: 1992, Page(s):39 - 42
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (381 KB)

    A course on microprocessor-based control systems in which an associated laboratory provides hands-on experience for concepts introduced in lectures is described. Laboratory experiments emphasize a variety of electromechanical and thermofluid control systems. Students begin at the gate and transistor level, progress through assembly software development, and finish by implementing data acquisition ... View full abstract»

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  • Fuzzy and adaptive control simulations for a walking machine

    Publication Year: 1992, Page(s):43 - 50
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (631 KB)

    The application of fuzzy logic and adaptive control algorithms to an eight-legged multivariable walking-machine system is described. A rule-based fuzzy control algorithm that eliminates the need for an explicit mathematical model of the system dynamics is examined. A model reference adaptive control (MRAC) is then considered. The performance of both the fuzzy logic control and adaptive control are... View full abstract»

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  • Trajectory control of flexible manipulators on a free-flying space robot

    Publication Year: 1992, Page(s):51 - 57
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (525 KB)

    A space robot consisting of a satellite main body that flies freely and manipulators that have structural flexibility is considered. The position and orientation of the satellite main body may change when the manipulators move. Motions of the space robots also induce vibrating motions of the structurally flexible manipulators. The control schemes used are the virtual rigid manipulator, pseudo-reso... View full abstract»

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  • A neural network controller for a temperature control system

    Publication Year: 1992, Page(s):58 - 64
    Cited by:  Papers (27)
    Request permission for commercial reuse | PDF file iconPDF (491 KB)
    Freely Available from IEEE
  • A fuzzy logic controller for a rigid disk drive

    Publication Year: 1992, Page(s):65 - 70
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (379 KB)

    A fuzzy logic algorithm is applied to a bang-bang controller for a rigid disk drive. The algorithm has the two functions of 'trial seek' and 'correction for uneven force'. The desired time of switching for bang-bang control is estimated using fuzzy logic: a method for correcting for actuator coil resistance due to temperature change is implemented. Experimental results illustrate the effectiveness... View full abstract»

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  • Reflex control of a robotic aid system to assist the physically disabled

    Publication Year: 1992, Page(s):71 - 77
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (666 KB)

    A robotic aid for the physically disabled that assists a user in feeding is presented. Two problems must be solved for a robot to feed a person. First, the robot must continually track the position of the person's face. Second, the robot must be able to get out of the way if the person moves suddenly. The first problem is solved with a machine-vision subsystem that computes the position of the per... View full abstract»

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  • An intelligent reactive monitoring and scheduling system

    Publication Year: 1992, Page(s):78 - 86
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1205 KB)

    A system developed for monitoring large-scale distributed processes and modifying the control plan in real time, in response to deviations from the planned production schedule, is reported. The monitoring method is based on behavioral models that represent and manipulate both discrete and continuous process dynamics. Reactive scheduling and control is accomplished by combining real-time problem so... View full abstract»

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  • Flexible control networks in mining machines to improve worker safety

    Publication Year: 1992, Page(s):87 - 94
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (703 KB)

    The integration of off-the-shelf components into a microcomputer-based control, communication, and data collection network that provides a base for computer-controlled mining machine research and coal production applications is described. Functions provided by the network include closed-loop control, teleoperation, navigation, data collection, and diagnostics. These functions are all provided to h... View full abstract»

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  • Reactive planning and control with mobile robots

    Publication Year: 1992, Page(s):95 - 100
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    A system that enables robots to perform nonelementary tasks in an environment where unpredictable demands require adaptation of the robots' actions is described. A motion control system dealing with this problem is implemented in the context of a representative motion task. The control system is composed of a planning module (written in the action network formalism) that governs various behaviors ... View full abstract»

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  • Gain scheduling: potential hazards and possible remedies

    Publication Year: 1992, Page(s):101 - 107
    Cited by:  Papers (297)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (490 KB)

    Current gain scheduling control of nonlinear practice is limited to slow variations in the scheduling variable. These limitations are revealed to be consequences of fundamental control concepts. It is shown how a reformulation of the gain scheduling procedure can lead to the ultimate removal of these restrictions.<> View full abstract»

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  • Comparison of controller designs for an experimental flexible structure

    Publication Year: 1992, Page(s):108 - 118
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (894 KB)

    Control system design and hardware testing are addressed for an experimental structure displaying the characteristics of a typical large flexible spacecraft. The practical aspects associated with designing and implementing various control design methodologies for a real system are described, and the results are given. The design methodologies under investigation include linear-quadratic-Gaussian (... View full abstract»

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  • Comments on 'Automated calibration of a fuzzy logic controller using a cell state space algorithm' (with reply)

    Publication Year: 1992, Page(s):120 - 122
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (222 KB)

    A shortcoming of the method presented in the above-titled article (ibid., vol.2, no.5, pp.18-28, Aug. 1991) when it is applied to a particular plant, namely, a DC motor with angular position feedback, is pointed out by the commenter. The authors elaborate on this shortcoming and correct some errors in the article.<> View full abstract»

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  • Gain and phase margins of SISO systems from modified root locus plots

    Publication Year: 1992, Page(s):123 - 127
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (342 KB)

    Graphically based methods for determining the gain margin and phase margin of linear time-invariant single-input, single-output (SISO) control systems are treated. The gain margin can be found from a graph showing the angle of each closed-loop system eigenvalue in the complex plane as a function of real gain. At any constant real gain, the phase margin can be identified from a graph of the angle o... View full abstract»

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  • The Routh-Hurwitz stability criterion, revisited

    Publication Year: 1992, Page(s):119 - 120
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    The related results of E.J. Routh (1877) and A. Hurwitz (1895), known today as the Routh-Hurwitz stability criterion, are discussed. Limitations of the criterion are pointed out View full abstract»

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As the official means of communication for the IEEE Control Systems Society, the IEEE Control Systems Magazine publishes interesting, useful, and informative material on all aspects of control system technology for the benefit of control educators, practitioners, and researchers.

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Editor-in-Chief
Jonathan P. How
jhow@mit.edu